The shear characteristics of fill joints in natural polyhedral morphology based on particle flow
The shear characteristics of joints is an important factor affecting the stability of rock masses.Based on the natural joint surface undulation profiles,numerical simulations using the Discrete Element Method(DEM)are conducted to investigate the shear characteristics of joints with natural and filled surfaces at thicknesses of 15 mm and 75 mm.The study analyzes the effects of joint undulation and filling thickness on shear characteristics and shear strength.The research findings indicate the following:(1)With the increase in filling thickness,the influence of undulation on the peak hardening and post-peak softening features of joints decreases,and the degree of post-peak softening decreases.(2)For joints with the same undulation profile,as the filling thickness increases,the failure mode transitions from joint shear failure to shear failure in the weak interlayer.When the filling ratio is less than 2,the primary failure modes are joint shear failure and joint-interlayer coupling failure.When the filling ratio is greater than 2,the predominant failure mode is shear failure in the weak interlayer.(3)When the filling ratio is less than 2,the peak shear strength of the structural surface decreases with the increase in filling ratio.However,when the filling ratio is greater than 2,there is no significant change in the peak shear strength of the structural surface.
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